Revolutionary element to fight it out (4)
I believe the answer is:
tito
'revolutionary' is the definition.
(I've seen this before)
'element to fight it out' is the wordplay.
'element' indicates the answer is hidden within the clue (I've seen 'element of' mean this (I've seen this in other clues)).
'TITO' can be found hidden inside 'to fight it out'.
(Other definitions for tito that I've seen before include "Statesman once" , "Adopted name of Josip Broz, Yugoslav leader" , "Yugoslav marshal" , "President of Yugoslavia, 1953-80" , "Former Yugoslav dictator" .)